-Vast clouds of hot gas embedded with numerous galaxies.
18 Dec 12
A galaxy cluster about 1.3 billion light years from Earth with a large elliptical galaxy in its center.
15 Aug 12
A galaxy cluster, whose official name is SPT-CLJ2344-4243, located about 5.7 billion light years from Earth.
02 Mar 12
A collision of massive galaxy clusters located about 2.4 billion light years from Earth.
12 Jan 11
A burgeoning galactic metropolis, the most distant known in the early universe.
08 Dec 10
The central elliptical galaxy in a group located about 105 million light years from Earth.
30 Aug 10
A composite image of the northern part of Abell 1758, located about 3.2 billion light years from Earth.
21 Jan 10
A galaxy plunging into the cluster Abell 3627 about 230 million light years away.
04 Jan 10
An elliptical galaxy in the Fornax cluster that contains an ultraluminous X-ray source.
09 Jul 09
A group of galaxies that is located about 280 million light years from Earth.
16 Apr 09
One of the most complex galaxy clusters, located about 5.4 billion light years from Earth.
30 Oct 08
A collision of two large clusters of galaxies about 3.8 billion light years away.
15 Oct 08
This composite image shows Abell 521, located about 2.9 billion light years from Earth.
27 Aug 08
A powerful collision of two galaxy clusters about 5.6 billion light years away.
20 Aug 08
The central region of a rich galaxy cluster about 250 million light years from Earth.
05 Aug 08
The largest galaxy in the Virgo cluster of galaxies at a distance of 60 million light years away.
10 Jan 08
A sample of nine galaxies each containing supermassive black holes in their centers.
20 Sep 07
A giant cluster of galaxies about 220 million light years from Earth with galaxy ESO 137-001 plunging into it.
30 May 07
Evidence for an awesome upheaval in a massive galaxy cluster was discovered in a Chandra image.
03 Jan 07
Astronomers have found a black hole where few thought they could ever exist, inside a globular star cluster.
02 Nov 06
A galaxy cluster located about 2.6 billion light years away in the constellation of Camelopardus.
21 Aug 06
Site of a collision between two large galaxy clusters about 3.4 billion light years from Earth.
06 Apr 06
A galaxy cluster with a central galaxy, NGC 1128, that has produced a giant double radio source known as 3C 75.
01 Dec 05
The central region of a rich galaxy cluster about 250 million light years from Earth.
08 Apr 05
Distant galaxy clusters compared with counterparts that are relatively close by.
25 Jan 05
A starburst galaxy located in galaxy cluster Abell 1367, about 300 million light years away.
02 Jan 04
A color composite image shows the X-ray light from 70-million-degree Celsius gas in the cluster.
03 Sep 03
Two galaxies in the Virgo galaxy cluster that are more than 100,000 light years apart.
01 Sep 03
A 53-hour Chandra observation of the central region of the Perseus galaxy cluster.
21 May 03
One of two massive galaxies that are enveloped by vast clouds of high-energy particles.
21 May 03
One of two massive galaxies that are enveloped by vast clouds of high-energy particles.
04 Apr 02
A cluster of galaxies about 500 million light years from Earth in the constellation Coma Berenices.
29 Jan 02
A cluster of galaxies about 170 million light years from Earth, located in the constellation Centaurus.
08 Jan 02
A cluster of galaxies about a billion light years from Earth, located in the constellation Aquarius.
06 Sep 01
A cluster of galaxies 4 billion light years distant in the constellation Draco.
05 Mar 01
A new Chandra image shows remarkable detail and complexity in the central region of a compact galaxy.
16 Nov 99
A large galaxy in the center of a cluster of galaxies located in the constellation Boötes.
Revised: December 19, 2012